Electrodeionization filter

Patent metadata

Field	Value
Publication number	US-12064728-B2
Application number	US-201916962122-A
Country	US
Kind code	B2
Filing date	Jan 8, 2019
Priority date	Jan 15, 2018
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An electrodeionization filter includes: a housing having a water inlet and a water outlet; a first electrode installed inside the housing in a spiral shape; a second electrode installed inside the housing in a spiral shape so as to be spaced apart from the first electrode; and an ion exchange module installed between the first electrode and the second electrode for adsorbing or desorbing ionic substances contained in water introduced by an application of electricity. At least one of the first electrode and the second electrode has a structure in which a center portion thereof is denser than a peripheral region thereof. Accordingly, the lifespan of the electrodes of the electrodeionization filter can be increased, and the assembly of the electrodes and related parts can be easily facilitated.

First claim

The invention claimed is:

1. An electrodeionization filter, comprising:
a housing equipped with a water inlet and a water outlet;
a first electrode installed inside the housing in a spiral form;
a second electrode installed inside the housing and spaced apart from the first electrode in a spiral form; and
an ion exchange module installed between the first and second electrodes and configured to adsorb or detach an ionic substance in water introduced by electricity applied thereto,
wherein at least one of the first and second electrodes has a structure in which a center region is denser compared to peripheral regions corresponding to regions above and below the center region, and
wherein the center region of the first electrode corresponds to the central portion of three equally divided portions of an overall height at which the first electrode is in contact with water.

2. The electrodeionization filter of claim 1 , wherein the first and second electrodes have a structure in which the center region of the first and second electrodes is denser compared to the peripheral region of the first and second electrodes.

3. The electrodeionization filter of claim 2 , further comprising a core member installed inside the ion exchange module and formed with an outlet through which purified water deionized in the ion exchange module is discharged,
wherein the first electrode is spirally coiled around an external surface of the core member.

4. The electrodeionization filter of claim 3 , wherein the first electrode is introduced into the ion exchange module through a fixing groove formed in the core member,
wherein the center region of the first electrode corresponds to the central portion of three equally divided portions between the fixing groove and an upper end of the core member.

5. The electrodeionization filter of claim 2 , further comprising a support member installed outside the ion exchange module and disposed with an opening,
wherein the second electrode is spirally coiled around an external surface of the support member.

6. The electrodeionization filter of claim 5 , wherein the second electrode is introduced into the housing through a second electrode installation hole formed in a bottom surface of the housing,
wherein the center region of the second electrode corresponds to the central portion of three equally divided portions between the second electrode installation hole and an upper end of the support member.

7. The electrodeionization filter of claim 1 , wherein the center region of the second electrode corresponds to the central portion of three equally divided portions of an overall height at which the second electrode is in contact with water.

8. The electrodeionization filter of claim 1 , wherein an average electrode pitch of the peripheral regions of the first and second electrodes is two to ten times an average electrode pitch of the center regions of the first and second electrodes.

9. The electrodeionization filter of claim 8 , wherein the average electrode pitch of the center region of the first electrode is 2 mm to 10 mm, and the average electrode pitch of the center region of the second electrode is 1 cm to 3 cm.

10. The electrodeionization filter of claim 3 , wherein the core member comprises a fitting recess formed on an outer circumferential surface thereof to fix a position of the first electrode.

11. The electrodeionization filter of claim 1 , wherein the center region of the first electrode has a denser structure as compared to the center region of the second electrode.

12. The electrodeionization filter of claim 1 , wherein the ion exchange module comprises bipolar ion exchange membrane formed by coupling a cation exchange membrane having a cation exchange resin and an anion exchange membrane having an anion exchange resin.

13. The electrodeionization filter of claim 1 , wherein the housing comprises a housing body in which an upper portion and a lower portion are exposed, an upper portion cover covering the upper portion of the housing body and a lower portion cover covering the lower portion of the housing body,
wherein the lower portion cover comprises first and second electrode installation portions through which the first and second electrodes are introduced into the housing, and the water inlet and outlet.

Assignees

• Coway Co Ltd

Inventors

• Lee Sang-Young
• Kang Sang-Hyeon
• Kim Chul-Ho
• Kwon Tae-Seong
• Moon Hyoung-Min
• Moon Sung-Min
• Lee Jun-Young
• Lee Byoung-Phil
• Mo Byung-Sun
• Lee Guk-Won

Classifications

• C02F1/4695 Primary

  electrodeionisation · CPC title

• B01D2325/42

  Ion-exchange membranes · CPC title

• B01D2313/345

  Electrodes · CPC title

• B01D69/02

  characterised by their properties · CPC title

• B01D61/445 Primary

  with bipolar membranes; Water splitting · CPC title